RULLINE AN6 Dual-Feed Braided Fuel Line for Holley 4150 Carburetor — 0–160 psi Vacuum Gauge, Aluminum Fittings

RULLINE AN6 Dual-Feed Double Pump Braided Fuel Line with a 0–160 psi vacuum pressure gauge is a complete replacement kit engineered to deliver consistent fuel flow to Holley 4150–style carburetors.

This kit is built for gas-delivery reliability: lightweight anodized aluminum fittings, stainless-steel braided hose, and an integrated 0–160 psi gauge allow you to monitor and maintain correct vacuum/pressure readings while feeding both primary and secondary carburetor bowls. Designed to fit any 4150 base carb, the assembly replaces worn factory lines and helps restore predictable fuel delivery for street and performance applications.

How does this dual-feed line improve fuel delivery to a Holley 4150 carburetor?

The dual-feed design separates primary and secondary circuits so fuel reaches each bowl without shared restrictions that can cause lean conditions during heavy throttle. RULLINE’s AN6 fittings and braided hose provide stable flow under vibration and heat, minimizing pressure drop.

• AN6 braided hose for consistent fuel capacity and minimal compression.
• Dual feed routing prevents starved secondary bowls during high demand.
• Secure threaded aluminum fittings reduce leak points compared with soft hoses.
• Integrated gauge lets you verify vacuum/pressure at a glance while tuning.

What materials and construction ensure durability under engine heat?

The line combines lightweight high-density aluminum fittings with stainless-steel nylon-braided hose, giving the assembly resistance to abrasion, heat, and oil exposure. Each component is precision-made and tested to meet repeated use in underhood environments.

• High-density aluminum fittings resist corrosion and handle repeated connections.
• Stainless-steel nylon braiding safeguards against chafing and heat damage.
• Crimped/assembled joints are built for vibration resistance and long life.
• Gauge housing and ports engineered to tolerate underhood temperature swings.

Is this kit easy to install and compatible with my engine setup?

The RULLINE kit is designed for direct fitment to any 4150–pattern carburetor base and simplifies replacement of old or leaking dual-feed lines. Basic hand tools are typically all you need, and the AN6 thread standard fits common aftermarket fuel systems and adapters.

• Compatible with Holley 4150 and other 4150 base carbs from common brands.
• AN6 fittings fit most aftermarket fuel connectors and adapters.
• Installation requires standard wrenches; no special tools usually necessary.
• Includes hardware assembled to quick-check vacuum/pressure readings.

How can the included 0–160 psi gauge help during tuning?

Monitoring vacuum/pressure near the carburetor helps identify fuel delivery issues, vacuum leaks, or pump performance problems during setup and diagnostics. The 0–160 psi range covers typical pressure spikes and allows you to observe changes under load so you can make informed adjustments.

• Instant visual feedback of pressure variations while tuning or road-testing.
• Detects irregularities from pump pulsation or fuel restrictions.
• Helps verify correct pressure for mechanical pumps and return-less systems.
• Useful when switching jets or calibrating for altitude and load.

Who is this for: Installers, home mechanics, and performance enthusiasts who run Holley 4150–pattern carburetors and need a durable, reliable dual-feed solution with monitoring capability. It’s suited for street-driven vehicles, track cars, and restoration projects where replacing aged or leaking fuel lines with a robust AN6 braided assembly and on-car gauge improves control and confidence.